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Effect of Stirring Speed in Hot Mixing Process of Modified Asphalt with SBS Copolymer on Polymeric Distribution and its Rheological Properties

Published online by Cambridge University Press:  04 March 2016

Esteban Alberto González García  and
Rafael Herrera Nájera
Esteban Alberto González García
Affiliation:
Facultad de Química, UNAM, Av. Universidad #3000, Ciudad México, Distrito Federal, 04510, México.
Rafael Herrera Nájera
Affiliation:
Facultad de Química, UNAM, Av. Universidad #3000, Ciudad México, Distrito Federal, 04510, México.
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Abstract

The current work reports the effect of particle size on the rheological behavior of polymer modified asphalt PMA. The modified asphalt was generated with AC-20 asphalt precursor provided by Pemex Salamanca and Solprene® 416 provided by Dynasol Mexico. Solprene® 416 is a SBS star-type copolymer with 4 poly(b-styrene-b-butadiene) arms and Mw = 2.36X105 g/gmole. Modified asphalt samples were prepared with 3 wt % of SBS via hot mix process. Mixing time and temperature were kept constant at 4h and 180 °C. This study also varied the agitation in the mixing process: 500, 1000 and 1500 rpm. All PMAs shown sphere-shaped polymer particles as observed via fluorescent microscopy using a Carl Zeiss KS-300 system. Base asphalt and PMAs were also characterized through rheological measurements using a TA Instruments AR-G2 rheometer. Shear viscosity (η) and tan δ data shown that the flow resistance of the PMA increases as the size its polymer particles decreases. Since the size of the polymer particles decreases with the increase of the stirring speed, it is concluded that the stirring speed of the process determines the size of the polymer particles and so the mechanical resistance of the PMA.

Keywords

compositemixturepolymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1813: Symposium 6C – Effect of SCM and Smart additives on the properties of concrete structures—2015 , 2016 , imrc2015-p020
Copyright
Copyright © Materials Research Society 2016 

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